Fuses - Danfoss VLT FC 101 Quick Manual

Quick Guide
91
92
93
L1 L2
L3
95
Figure 1.19

1.3.6 Fuses

Branch circuit protection
In order to protect the installation from electrical and fire
hazards, all branch circuits in an installation, switch gears,
machines etc., must be protected from short-circuits and
overcurrents according to national/international
regulations.
Short circuit protection
Danfoss recommends using the fuses mentioned in the
following tables to protect service personnel or other
equipment in case of an internal failure in the unit or
short-circuit on DC link. The Adjustable frequency drive
provides full short circuit protection in case of a short-
circuit on the motor.
Overcurrent protection
Provide overload protection to avoid overheating of the
cables in the installation. Overcurrent protection must
always be carried out according to national regulations.
Fuses must be designed for protection in a circuit capable
of supplying a maximum of 100,000 A
480 V maximum.
Non UL compliance
If UL/cUL is not to be complied with, Danfoss recommends
using the fuses mentioned in Table 1.18, which will ensure
compliance with IEC 61800-5-1:
In case of malfunction, not following the fuse recommen-
dation may result in damage to the Adjustable frequency
drive.
VLT HVAC Basic Drive Quick Guide
88
89
81 8
DC-
DC+ R-
R+
96
97
98
U
V
W
99
(symmetrical),
rms
®
MG18A322 - VLT is a registered Danfoss trademark
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